Electrical alarm system.



A. GOLDSTEI N. ELBGTRIOAL ALARM SYSTEM.

APPLIOATION FILED AUG, 6, 1910.

Patented Feb. 14, 191 1.

JTZUGILiO/l WW2 (Uimeaagu:

ALBERT GOLDSTEIN, OF NEW YORK, N. Y.,

ASSIGNOR TO INTEB NATIONAL ELECTRIC PROTEGTIONODMPANY, A CORPORATION 01'! NEW YORK.

ELECTRICAL. ALABM SYSTEM.

' Specification 5f Letters Patent. Patented Feb. 14:, 1911.

Application filed August 8, 1910. Serial No. 576,900.

To all whom it may concern:

Be it known that'I, ALBERT Gonosrnm, a

citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Electrical Alarm Systems, of which the following is a specification.

In U. S. Letters Patent No. 966,903, granted to me August 9th, 1910, and filed March 28th, 1910, I have set forth an electrical alarm system which has for its object the utilization of a telephonecircuit also as a burglar alarm circuit. At the transmit ting or subscribers station are arranged the usual telephonic transmitting devices, and also the protective circuit which may comprise a number of loops in series so as to extend to various localities-as, for example, ,windows and doors-in a building which it is desired to protect. The rotective circuit is in shunt from the main line circuit, and is normally closed. When the telephone receiver is removed from its switch arm, the closing of main circuit by said arm'in the ordinary way causes a magnet in said main circuit to become energized from the distant or receiving station, and said magnet thereupon moves its switch to open Send rot-ective circuit. Hence said protective circuit shunt is automatically cut out while the subscribed is talking, and does not interfere with speech transmission; At

the receiving or central ofiice end of the line are provided the usual translating devices and an-alarm circuit associated therewith, which alarm circuit is so constructed as that upon the occurrence of a break or other abnormal electrical condition onthe line, the alarm will be sounded. Also at the receiving station is another and separate alarm circuit which is never connected to. the a switch is thrown to connect the telephonic apparatus at the transmitting station with the translating devices at the receivin station, the ordinary conditions of tele onic transmission are present, with the a d-ition that accidental breaks or disturbances on construction, a telephone subscriber may, at

any desired hour, notify his telephone exchange that for some stated period of time he desires his telephone service out oif and burglar alarm made eflective. The opera tor at the exchange'then simply throws the switch before noted, and thereafter any tampering with the subscribers protective circuit or abnormal condition on-the line is at once announced by the alarm at said exchange. v

It may happen that atthe time the subscriber directs the connection of his protective circuit with the alarm system, there may already be trouble on the protective circuit; In m aforesaid apparatus, this trouble is in icated to the operator at the alarm statiom'as soon as he throws the switch. But the subscriber may be wholly ignorant of it, and hence may leave his premises for the ni ht, for example, supposing that.

everythmg is all right, whenthe contrary is true. My present invention obviates this difiiculty by providing means whereby the operator at the alarm station may communicate with the. subscriber directly, as soon as the alarm connectionis made, to send him an yO/K. si a1 ifno troubleis indicated, or to advise him as to the-trouble, so that it can be at once corrected. The means of intercom- Imunication operates in both directions, and,

Theuvcoinpairviug drawii'ig is anelectrical trouble. If no trouble is indicated by she diagram, showing the application of my iugalvanonieter needle y', or when the needle vc'ntion to a typical Bell telephone circuit. comes to balanced position, the operator uses As shown in my aforcsaid'Letters Patent, key P to send an O. K. signal. Considering a the line circuit, of which the members are the whole system, it will be apparent that the 7 indicated at a, 'b, unites the subscribers sta telephone operator at theexchange B gets 1ion at A. to the central otiice at B. The his instructions-from the subscribers Sta switch H instead of being at the central oiiice, tion by means of the lamp 9; the wire chief now located at another station indicated at also at the exchange watches the indications L, and hereafter-termed the burglar alarm of lamp 79, which, as already explained in office, which may-be distant from the central" my aforesaid Letters Patent,becomes lighted oliicc. The apparatus at the central otiice B when either abreak ora ground occurs on the,

HlClIlClES the battery 7, line rela 8, line lamp line: the burglar alarm oflice operator gets 9, switches 10 of the cut 0% relay '(not his signal to throw switch H from lamp Q.

shown), jacks 11 (only one shown), the cord Because lamps p and Q are connected, both 0 circuit (which includes the two windings 12 the wire chief and the burglar alarm operaof the. repeating coil, supervisory relay 13 tor simultaneously learn of the subscribers and plug contacts 1%),1nagnetsK, J, switches direction to change from telephone to bury, a, contacts *1, '1", 8, battery 0 and lamp glar alarm service. After the change has p, and is the same as already described in been made, then by reason of the telegraph my aforesaid Letters Patent. The apparakeys and sounders described, the burglar tus at the subscribers station A, which in alarm operator and subscriber may communieludes the bell 1, condenser 2, induction coil cate, either to permit the burglar alarm 0p- 3, transmitter l, receiver 5, switch 6, magnet erator to send in at once an O. K. signal, or

E, shunt f, switch 6, shunt conductor 0, proif he finds trouble on the subscribers circuit,

tective circuit C, short-circuiting levers D, to send such notification thereof as will in is also the same as described in my aforesaid sure its removal, beforeany 0. K. signal is Letters Patent. The apparatus at the burtransmitted,

glar alarm oiiice L includes the alarm circuit I claim: 30 I, co-mprlslngwlres t, t, galva-nometer 0011 1. The combination with a telephonic cir- 2' connected to ground at G, balanced needle cuit including subscrihers and central staarm j, battery is and glow lamp l, and is also tion telephonic transmitting and receiving the same as in my a oresaid Letters Patent. apparatus, and means for transmitting and The structual additions to the foregoingreceiving call signals, ofa protective circuit system are as follows: At the subscribers at the subscribers station, means at'a stastation A, and interposed in the'sh'unt contion distant from said subscpibers station ductor 0, between the switch 6 and the profor indicating trouble on said protective tective circuit C, a telegraph sounder M and circuit, and means independent of said telea key N. In the alarm circuit wire 25 and at phone apparatus and said call signal and the burglar alarm oili'ce L and between one receiving means for signaling over said tele- 9 contact of switch and battery 70, a telephonic circuit from said distant station to graphic sounder O and a key P. Also at said subscribers station.

the burglar alarm ol'lice L, a lamp Q, in.' 2. The combination with a telephonic cirshunt with lamp 7;. cuit including subscribe'rs and central sta- 45 The operation of present invention is tion telephonic transmitting and receiving as follows: When the subscriber desires to apparatus and means for transmitting and connect his station with the burglar alarm receiving call signals, ofa protective circuit ofiice L and disconnect it from the telephone at the subscribers station, means at a station central ofiice B, he sends any predetermined distant from said subscribers station forin- 50 signal to the-operator at L, by means of the dicating trouble on said protective circuit, telegraph key N This signal -is translated means for connecting to line either said inat L by a flickering of the lamp Q, and theredicating means or said central station appaupon the operator at L throws the switch H ratus, and means. in circuit with said indito establish the subscribers connection cating'means and independent of said cen- 55 through the wires 25, t to the alarm circuit 1. .tral station apparatus and said call signal The operator at L then observes the needle and receiving means for signaling between j of galvanometer coil 2", which, if deflected, said distant station and said subscribers indicates tronblcon the subscribers circuit; station.

.4 thus, for cxan'lple. such deflection will occur The combination of a line circuit ex- 60 it all the switch levers D of the protective tending between distant stations, and, at one circuit C are not open. l/Vhen such trouhleis station, telephonic receiving and transmitshown the operator communicates with the ting devices, a signal receivmgdevice ands; subscribers stationmeans of his key P protective circuit, and, distant therefrom, and-the subscribers sounder M, and gives telephonic translating devices, a separate 6 such directions as willcause'removal of said alarm circuit, means for connecting to line 0 either said translating devices or said alarm circuit, and means in said alarm circuit for transmitting signals, to said signal receiving device at said firstmamed station.

4. The combination ()ffl line circuit extending between distant stations, 'and,at one station, telephonic receiving and transmit ting devices, means for receiving signals, means. for transmitting signals and apro tective circuit, and, distant therefrom, tele phonic translating devices, a separate alarm circuit, means for connecting to line either said translating ,devices'or said. alarm circult, and 1n sald alarm circuit, means for receiving signals and means for transmitting distant therefrom, telephonic translating devices, a separate alarm circuit and a sw1tch,'the atoresald switch operat ng to connect the telephonic apparatus at said first station either to the translating devices The combination of a line circuit ex or tothe separate alarm circuit at the dis tant station, and means disposed in said protective circuit and in said alarm circuit forcommumcating between said stations.

7. The combination of a line circuit. ex-

- tending between distant stations, and, at one station (A) telephonic receiving and transmitting dev1ces,.a protective circuit and in said protective circuit 'akey and sounder, and, at another station (3) telephonic translating devices, and, at a third station (L) an alarm circuit, a key and sounder therein and a switch; the said switch operating to connect the telephonic apparatus at said station A either to thetranslating devices at station E or cuit at station L.

8. The combination of a line circuit extending between distant stations, and, at one station (A) telephonic transmitting and re ceiving devices and a protective circuit, and, at another station (E) telephonic translating devices, and, at a third station (L) an alarm circuit, a switch and a separate alarm signal: the said switch operating to connect the telephonic apparatus at said station A with (1) the translating devices at station to the said alarm cir- B and the separate alarm signal at station v L, or with (2) the alarm circuit at station L. In testimony whereof I have, afiix ed my signature in presence of two witnesses.

I ALBERT GOLDSTEIN.

Witnesses:

GERTRUDE T. lon'rnn,

MAY T. MCGABRY. 

